site_archiver@lists.apple.com Delivered-To: pro-apps-dev@lists.apple.com User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 Peter, Darrin, Pete, Yeah, I can see the dilemma you’re facing. Can you create your own OpenGL context before calling into the temporal image API? If you do, what happens? Darrin On Sep 8, 2017, at 2:08 PM, Peter Litwinowicz <pete@revisionfx.com> wrote: Hey Darrin, et al., So I'm writing a plugin that is doing an analysis pass on a sequence. I do this in response to a user clicking a UI button in our plug-in interface. When I get CPU memory images using [FxTemporalImageAPI getBitmap] everything works just fine. However, if I try to get GPU texture, using [FxTemporalImageAPI getInputTexture], then I can't get the bits because the current OpenGL context is not set up. If I call [FxTexture textureID] and [FxTexture getTextureCoords], etc. I get the proper values. Calling –bind or –enable doesn't work either. Darrin, is there a way I can successfully use GPU textures if I'm not in –renderOutput? I presume I would need the OpenGL context and set the current context to that, but that is not something I've been able to successfully retrieve. Pete _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com I used to experience exactly the same problem. I tried to create OpenGL context in a working thread, but [... getInputTexture] failed (don't remember exactly either with an error code or with empty black textures) all the same. I also tried to use shared OpenGL contexts, but I'm not experienced with it and I don't know either it doesn't work or I just used them incorrectly. Anyway I stopped trying cause my processing is written using OpenCL through OpenCV and it doesn't support multiple contexts which is required by plugins workflow. So I ended up with using [... getBitmap] method. However if you succeed some way with this, please let me know. Probably it is a matter of using shared contexts or setting context properly.